Spring Cloud Feign高级应用实例详解
这篇文章主要介绍了Spring Cloud Feign高级应用实例详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
1.使用feign进行服务间的调用
Spring boot2X Consul如何使用Feign实现服务调用
2.开启gzip压缩
Feign支持对请求与响应的压缩，以提高通信效率，需要在服务消费者配置文件开启压缩支持和压缩文件的类型
添加配置
feign.compression.request.enabled=true feign.compression.response.enabled=true feign.compression.request.mime-types=text/xml,application/xml,application/json feign.compression.request.min-request-size=2048
3.开启日志
配置
logging.level.com.xyz.comsumer.feign.RemoteHelloService=debug
添加FeignLogConfig类
package com.xyz.comsumer.configure;
import feign.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class FeignLogConfig {
@Bean
Logger.Level feignLogger(){
return Logger.Level.FULL;
}
}
输出
2019-12-07 23:23:03.630 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] <--- HTTP/1.1 200 (671ms) 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] content-length: 14 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] content-type: text/plain;charset=UTF-8 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] date: Sat, 07 Dec 2019 15:23:03 GMT 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Origin 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Access-Control-Request-Method 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Access-Control-Request-Headers 2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] 2019-12-07 23:23:03.632 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] hello,provider 2019-12-07 23:23:03.632 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] <--- END HTTP (14-byte body)
说明：
Feign日志记录只能响应DEBUG日志级别
对每一个Feign客户端，可以配置一个Logger.Level对象，通过该对象控制日志输出内容。
Logger.Level有如下几种选择：
NONE, 不记录日志 (默认)。
BASIC, 只记录请求方法和URL以及响应状态代码和执行时间。
HEADERS, 记录请求和应答的头的基本信息。
FULL, 记录请求和响应的头信息，正文和元数据。
4.替换JDK默认的URLConnection为okhttp
在默认情况下 spring cloud feign在进行各个子服务之间的调用时，http组件使用的是jdk的HttpURLConnection
服务之间调用使用的HttpURLConnection，效率非常低
为了提高效率，可以通过连接池提高效率
使用okhttp，能提高qps，因为okhttp有连接池和超时时间进行调优
添加依赖
<dependency> <groupId>io.github.openfeign</groupId> <artifactId>feign-okhttp</artifactId> </dependency>
修改配置
禁用默认的http，启用okhttp
feign.okhttp.enabled=true feign.httpclient.enabled=false
添加FeignOkHttpConfig类
package com.xyz.comsumer.configure;
import feign.Feign;
import okhttp3.ConnectionPool;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.cloud.openfeign.FeignAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.concurrent.TimeUnit;
@Configuration
@ConditionalOnClass(Feign.class)
@AutoConfigureBefore(FeignAutoConfiguration.class)
public class FeignOkHttpConfig {
@Bean
public okhttp3.OkHttpClient okHttpClient(){
return new okhttp3.OkHttpClient.Builder()
.readTimeout(10, TimeUnit.SECONDS)
.connectTimeout(10, TimeUnit.SECONDS)
.writeTimeout(20, TimeUnit.SECONDS)
.retryOnConnectionFailure(true)
.connectionPool(new ConnectionPool())
.build();
}
}
5.超时设置
Feign调用服务的默认时长是1秒钟
hystrix的超时时间
hystrix.command.default.execution.timeout.enabled=true hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=10000
说明：
hystrix.command.default.execution.timeout.enabled 执行是否启用超时，默认启用true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds 命令执行超时时间，默认1000ms
常用的配置还有
hystrix.command.default.execution.isolation.strategy 隔离策略，默认是Thread, 可选THREAD｜SEMAPHORE，建议选择SEMAPHORE
Feign 的负载均衡底层用的就是 Ribbon
ribbon的超时时间
ribbon.ReadTimeout=10000 ribbon.ConnectTimeout=10000
6.使用hystrix进行熔断、降级处理
feign启用hystrix，才能熔断、降级
feign.hystrix.enabled=true
hystrix服务降级处理
RemoteHelloServiceFallbackImpl
package com.xyz.comsumer.feign.fallback;
import com.xyz.comsumer.feign.RemoteHelloService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class RemoteHelloServiceFallbackImpl implements RemoteHelloService {
private final Logger logger = LoggerFactory.getLogger(RemoteHelloServiceFallbackImpl.class);
@Override
public String hello() {
logger.error("feign 查询信息失败:{}");
return null;
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持【听图阁-专注于Python设计】。
